Pool exercise device



FIG. 1 is a perspective view of a pool exercise device showing my new design;

FIG. 2 is an overhead plan view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a first end view thereof; and,

FIG. 5 is a second end view thereof. 

The ornamental design for a pool exercise device, as shown and described. 